Ask us about Line 10

We’re committed to keeping communities near our pipelines informed of our efforts to ensure safety and environmental protection. We understand you may have questions related to Line 10 and our Westover Segment Replacement Project. We’re happy to answer them.

Below is a question and answer section; you may find your question has already been asked and answered. If not, please email us at . We’ll answer your question directly by email, and — provided they aren't repeating already published Q&A — we'll add it to the appropriate topic section below.


Line 10 and the Westover Segment Replacement Project
Safety and preventative maintenance
Land and environment
Community and economic benefits

Line 10 and the Westover Segment Replacement Project

Why is this project necessary?
To proactively address pipeline maintenance requirements, improve reliability and safety, and restore Line 10 to its original operating capacity. Investments like these in routine maintenance, technology and upkeep are critical to the ongoing safe operation of all Enbridge pipelines and infrastructure.

Why now?
In recent years, this segment has experienced an increasing number of preventative maintenance digs to visually inspect and repair the line, and has therefore reached our conservative threshold for replacement. Based on our predictive model, it is more economical to replace this segment in the short term than it would be to apply several preventative maintenance digs to the line.

We seek to identify and address any future concerns well before they could pose a threat to the public or the environment. As such, strategic and regular investments in routine maintenance, technology and upkeep—like the Westover Segment Replacement Project—are critical to the ongoing fitness of all of our pipelines and infrastructure.

Why are you installing larger pipe for this segment of the line?
The majority of Line 10 was replaced with 20-inch diameter line in the 1970s and 1980s—the Westover-to-Binbrook segment is one of the line’s original 12-inch segments. Replacing the Westover-to-Nanticoke Junction segment with 20-inch pipe is more hydraulically efficient—it will allow us to move the same volume of product while using less energy.

What happens to the pipe that you are replacing?
The pipeline that’s being replaced will be safely and permanently removed from service and left in the ground, a standard industry practice which minimizes the construction impact on communities and the environment as well as the stability issues that surround soil disturbance. We will maintain cathodic protection to monitor the decommissioned line along with other pipelines that share the right-of-way.

What products are shipped through Line 10?
Line 10 carries light and heavy crude oil from Western Canada and the Bakken region (Saskatchewan, Manitoba, Montana and North Dakota). The oil we transport must meet rigorous quality specifications as filed with the National Energy Board and the U.S. regulator. We can only carry products that meet these specifications. Enbridge maintains strict enforcement of quality standards for every batch of product entering our pipelines, including Line 10.

Is this project really only intended to increase the amount of oil going through Line 10?
The Westover Segment Replacement Project is driven by safety considerations and the routine maintenance and fitness of the Line 10 pipeline system. This is not a capacity expansion, but a capacity restoration. No increase to the stated operating capacity of 74,200 barrels per day (bpd) is being applied for.

What do you mean by ‘capacity restoration’?
Upon completion of this project, Line 10 will more closely approximate what it has carried in the past, up to 74,200 barrels per day (bpd) of oil. Since November 2013, Line 10 has operated under a pressure restriction that limits its daily capacity to a maximum of 63,500 bpd. Pressure restrictions ensure the continued safe operation of a pipeline and can be imposed by a regulator or voluntarily undertaken by an operating company. In this case,
Enbridge put the restriction in place voluntarily, following detailed engineering and technical analysis.

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Safety and preventative maintenance

Is the existing pipeline safe?
Line 10 remains fully safe to operate. Like all Enbridge pipelines, it’s monitored around-the-clock and rigorously maintained by highly trained personnel using proven inspection and monitoring technology.

What is your emergency response capacity in the area?
We have a strong Enbridge and local contractor support network that can be deployed, on-call, 24/7/365. We also have significant caches of emergency response equipment near the Line 10 right-of-way at Westover, in Mississauga, within the region, and at our Edmonton control centre. These resources can be moved and concentrated at any point along the line to support an emergency response.

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Land and environment

What steps will you take to protect the environment?
A full environmental and socio-economic impact assessment is being conducted as part of our regulatory application for this project. The assessment will be public, describing the predicted beneficial and potential adverse effects over the life of the project, including any mitigation measures that may be required.

How will you protect the environment?
Protecting the environment, compliance with regulatory requirements, and maintaining good community relations are important to Enbridge. Here are some of the things we do:

  • All preventative maintenance dig sites are assessed to determine environmental issues or restrictions.
  • Work within environmentally sensitive areas is planned on a site-specific basis and special mitigation measures will be used to minimize potential impacts.
  • Enbridge must obtain all necessary licenses, permits and approvals before work begins.
  • Our environmental management practices include an environmental assessment on all work locations prior to starting work and the development of mitigation measures to minimize or eliminate environmental impact.
  • A post-reclamation assessment is completed one year after integrity dig reclamation to ensure the site has been returned to its original condition.

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Community and economic benefits

What are the project benefits?
The project will create benefits for the local economy through employment opportunities and spinoffs for goods and services required to support construction and ongoing operations. As construction crews move through communities along the Line 10 right-of-way, those crews will require goods and services, such as food, lodging, laundry services, gas, hardware, and equipment repair, from local retailers. We anticipate a peak labour force of approximate 300 persons will be needed to complete construction.

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